Malicious PDF — malware analysis report

Static analysis result for SHA-256 6feefd0acfef2d9f…

MALICIOUS

PDF

77.3 KB Created: 2021-04-07 08:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04832688d1384c712055bffabf797079 SHA-1: e7f93c515a93ce68496e2233063b9ab8634d1c7a SHA-256: 6feefd0acfef2d9f3f4826bd2bb791fcf9bd9ad7c2a7d7538f4b7ccd4448aaa8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary technique appearing to be SEO spam or a phishing lure disguised as a consumer report. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=costco+hearing+aids+consumer+reports PDF link annotation
    • http://microbladingcertificationdfw.org/brother_pt_h100r_tape9ynx7.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/hells_vengeance_v2_controls_pcugqea.pdfIn PDF document text
    • http://cabinetshq.xyz/general_characters_of_chordatest68y8.pdfIn PDF document text
    • http://argo-tourism.com/walamadutopogewenij7yaea.pdfIn PDF document text
    • http://shmelev.pro/motorsport_manager_hq_guide4rhbv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_b00a3eac923a4599a65de33cb3318ef9.pdf?index=trueIn PDF document text
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_da9c4fe1a35e4e47b193eef41c5ad031.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb44b72-bd85-4121-9cdc-428095fd1bca/59665155735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61cdafd0-1ff4-4269-8477-88740a115dd0/36114706914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54cfef0-92d4-4792-aee8-1669cab7fda9/how_to_set_up_voicemail_on_vtech_home_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d91d84-caa4-4249-8ee6-5dbb06a133c5/luwodofebivu.pdfIn PDF document text
    • https://264aa3b4-28a3-4a3b-9cf4-afdf28ba9476.filesusr.com/ugd/28a074_89debf50fdb04122af8936505be4483d.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_edcb64db9c534302b8e57275577e3a97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee46421e-e31c-4e25-ae4c-0e9440eaed56/honeywell_lynx_plus_manual.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_f6fbf3906570407aa62629c5a7b537c9.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_9363825690244b11ad371b2b45798923.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a7ced32-f073-4bbd-b28d-caa689cd7fd4/67375607825.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_887f0f3eab67455592c6a1f3ec60d1fe.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_f95549e645a94ba3ae0eef1175877834.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/729fc281-7ffe-456c-9137-9ac025feabfc/mixugusigutuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93760289-8107-4082-b888-a0fd6809ac82/mystery_of_power_words_book.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_8b4aa6062e7f41b6a4a5ebe640976b75.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 5360 bytes
SHA-256: f22741d8dd7d3b955fcef031bb8911a05ab5ac28bacbbba3c52ec94e987b71d4
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 10480 bytes
SHA-256: a3739ecbb529b68cdbae65c967c6ebddb74e3aa9305ee548edb6a8b9e0702356

Open this report in the interactive analyzer, or submit your own file for analysis.